/**
 *    Copyright (C) 2014 MongoDB Inc.
 *
 *    This program is free software: you can redistribute it and/or  modify
 *    it under the terms of the GNU Affero General Public License, version 3,
 *    as published by the Free Software Foundation.
 *
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU Affero General Public License for more details.
 *
 *    You should have received a copy of the GNU Affero General Public License
 *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 *    As a special exception, the copyright holders give permission to link the
 *    code of portions of this program with the OpenSSL library under certain
 *    conditions as described in each individual source file and distribute
 *    linked combinations including the program with the OpenSSL library. You
 *    must comply with the GNU Affero General Public License in all respects for
 *    all of the code used other than as permitted herein. If you modify file(s)
 *    with this exception, you may extend this exception to your version of the
 *    file(s), but you are not obligated to do so. If you do not wish to do so,
 *    delete this exception statement from your version. If you delete this
 *    exception statement from all source files in the program, then also delete
 *    it in the license file.
 */

#include "mongo/db/jsobj.h"

namespace mongo {

    int getGtLtOp(const BSONElement& e) {
        if ( e.type() != Object )
            return BSONObj::Equality;

        BSONElement fe = e.embeddedObject().firstElement();
        return fe.getGtLtOp();
    }

    bool fieldsMatch(const BSONObj& lhs, const BSONObj& rhs) {
        BSONObjIterator l(lhs);
        BSONObjIterator r(rhs);

        while (l.more() && r.more()){
            if (strcmp(l.next().fieldName(), r.next().fieldName())) {
                return false;
            }
        }

        return !(l.more() || r.more()); // false if lhs and rhs have diff nFields()
    }

    Labeler::Label GT( "$gt" );
    Labeler::Label GTE( "$gte" );
    Labeler::Label LT( "$lt" );
    Labeler::Label LTE( "$lte" );
    Labeler::Label NE( "$ne" );
    Labeler::Label NIN( "$nin" );
    Labeler::Label BSIZE( "$size" );

    GENOIDLabeler GENOID;
    DateNowLabeler DATENOW;
    NullLabeler BSONNULL;
    UndefinedLabeler BSONUndefined;

    MinKeyLabeler MINKEY;
    MaxKeyLabeler MAXKEY;

    BSONObjBuilderValueStream::BSONObjBuilderValueStream( BSONObjBuilder * builder ) {
        _builder = builder;
    }

    BSONObjBuilder& BSONObjBuilderValueStream::operator<<( const BSONElement& e ) {
        _builder->appendAs( e , _fieldName );
        _fieldName = StringData();
        return *_builder;
    }

    BufBuilder& BSONObjBuilderValueStream::subobjStart() {
        StringData tmp = _fieldName;
        _fieldName = StringData();
        return _builder->subobjStart(tmp);
    }

    BufBuilder& BSONObjBuilderValueStream::subarrayStart() {
        StringData tmp = _fieldName;
        _fieldName = StringData();
        return _builder->subarrayStart(tmp);
    }

    Labeler BSONObjBuilderValueStream::operator<<( const Labeler::Label &l ) {
        return Labeler( l, this );
    }

    void BSONObjBuilderValueStream::endField( const StringData& nextFieldName ) {
        if ( haveSubobj() ) {
            verify( _fieldName.rawData() );
            _builder->append( _fieldName, subobj()->done() );
            _subobj.reset();
        }
        _fieldName = nextFieldName;
    }

    BSONObjBuilder *BSONObjBuilderValueStream::subobj() {
        if ( !haveSubobj() )
            _subobj.reset( new BSONObjBuilder() );
        return _subobj.get();
    }

    BSONObjBuilder& Labeler::operator<<( const BSONElement& e ) {
        s_->subobj()->appendAs( e, l_.l_ );
        return *s_->_builder;
    }

} // namespace mongo
